题目内容
We all cry for water when we are thirsty. But do you know,in very hot,dry weather,plants also make very low sounds as if they are crying for help?
You see,in a plants stem there are several hundred “water pipes”that bring water from soil all the way up to the leaves. When the ground turns dry,it becomes harder and harder for plants to do this.
In very hot days,plants have to get any water that they can get.
Scientists Robot Winter has found out that when plants can get no water,their “ water pipes ” snap (发出声音) . When that happens,the whole plant vibrates (颜动) a little.
Robot knows that healthy,wellwatered plants are quiet. He also knows that dry plants are many insects’ favorites and they often attack (袭击) them. How do the insects know which are healthy plants and which are not? Robot thinks that the insects may hear the plants “crying” and they may come to kill them.
26. There are many “water pipes” .
A. in a plant’s stem B. in a plant’s root
C. in the sunshine D. in the soil
27. It for plants to get water when the ground turns dry.
A. is easy B. is difficult
C. takes little time D. is not necessary
28. When plants can ,their “water pipes” snap.
A. grow well B. get no sunlight
C. have enough water D. get no water
29. When“water pipes”snap,the whole plant .
A. keeps quiet B. gets well
C. vibrates a little D. makes very loud sounds
30. Many insects like to attack .
A. quiet plants B. dry plants
C. healthy plants D. wellwatered plants
26. A 由 “ You see,in a plant’s stem there are several hundred ‘water pipes’ ...”可知，“水管道”在植物的莲里。
27. B 由“ When the ground turns dry,it becomes harder and harder for plants to do this. ” 可知，当天气干旱时，对于植物来说，得到水分越来越难。
28. D 由‘‘".when plants can get no water,their “water pipes” snap. ”可知，植物得不到水分时，它们的“水管道”会发出声音。
29. C 由“When.that happens,the whole plant vibrates a little." 可知，当“水管道”发出声音时，整个植物会有一点颤动。
30. B 由句子“He also knows that dry plants are many insects’favorites and they often attack them." 可知，昆虫袭击干旱的植物。
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